Modern computer architectures, with multicore CPUs and GPUs or other accelerators, make stronger demands than ever on writers of scientific code. Normally, the most efficient program has to be written — using a substantial effort — by expert programmers for a certain application on a particular computer. This thesis deals with several algorithmic and technical approaches towards effectively sat...

Data can be distinguished according to volume, variable types and distribution, and each of these characteristics imposes constraints upon the choice of applicable algorithms for their visualisation. This has led to an abundance of often disparate algorithmic techniques. Previous work has shown that a hybrid algorithmic approach can be successful in addressing the impact of data volume on the f...

In this paper, we analyze the performance of estimation algorithms for discrete-time stochastic linear hybrid systems. The problem of being able to estimate both the discrete and continuous states of a hybrid system given only the continuous output sequence is a difficult one, and while algorithms [1], [2] exist for this purpose, little has been proved on the limitations of these algorithms, or...

A challenge to modeling and monitoring the health of the ocean environment is that it is largely under sensed and difficult to sense remotely. Autonomous underwater vehicles (AUVs) can improve observability, for example of algal bloom regions, ocean acidification, and ocean circulation. This AUV paradigm, however, requires robust operation that is cost effective and responsive to the environmen...

In this paper we describe a method for near real-time identification of attack behavior and local security policy violations taking place over SSH. A rational is provided for the placement of instrumentation points within SSHD based on the analysis of data flow within the OpenSSH application as well as our overall architectural design and design principles. Sample attack and performance analysi...

We introduce the method of clausal graph tableaux at the example of hybrid logic with difference and star modalities. Clausal graph tableaux are prefix-free and terminate by construction. They provide an abstract method of establishing the small model property of modal logics. In contrast to the filtration method, clausal graph tableaux result in goal-directed decision procedures. Until now no ...